CR - The Toe Tag Quintet, Matthew Condon

A set of short stories, I've been reading these in an amongst other things.

From the Blurb:

Retirement can be murder! The adventures of a former Sydney detective from 21 Division who, in his prime, collared some of the most murderous criminals in Australian history yet, on retiring to the Gold Coast in Queensland, along with half of the criminal milieu he once pursued, is shot, king-hit, tortured, and thrown from buildings in his relentless pursuit of justice.